1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb812056a086ffc124bf2578b02f3af8013d9bc8fb4e5ba23bf7261e4d28f9b7. Chain 2 (Bitcoin): anchored in block 954131 (2026-06-17T19:19:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7cd1500a-2d30-4ae3-91ca-1eb5379b6e8f.json and https://artists.proofprofile.net/proofs/artist/7cd1500a-2d30-4ae3-91ca-1eb5379b6e8f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Messe de Nostre Dame: Introitus. Gaudeamus omnes in domino
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880c164927817a1a4acd9c7ea1aea1ca03c14d6d226d60a1afe8ab8e8604db00. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331111846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c66bbcc1d378a4b2f4f5b689a2f9314dfffc9ed94d55b23077d230ab2328376. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331111847.
Messe de Nostre Dame: Gloria in excelsis deo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65eac926e4460ee3d441684116ff8d3906589b6561ce4d6a17df3e53a0532185. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331111848.
Messe de Nostre Dame: Credo in unum deum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c9177dc47ce58ac72eedd845725f9ee4510a5cae68fc26d14b12d2c74f01ce3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331111854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfa567444dca38c223041cf51b8412469162c83c64a82c8ec88b8c958b48ab40. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331111862.
Messe de Nostre Dame: Offertorium. Diffusa est gratia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12cf1ee83e919731b148ef7fd37e5e3559aecb707426ce3d0bac2936d84ec7da. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331111855.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Messe de Nostre Dame: Sanctus & benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd23de357ea0b00d3eb1765a9bf77e50342db7d9b6251d2df093c3ab6ba32dd7. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331111857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714f7f47d0c255a75be0564cc15c8a23e9833a1bf82aa4371f4f3f84b270373a. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331111859.